PEFR: Peak Expiratory Flow Rate (PEFR) measurements with Wright...

In MethComp: Analysis of Method Comparison studies

Description

Measurement of PEFR with Wright peak flow and mini Wright peak flow meter on 17 individuals.

Usage

data(PEFR)

Format

A data frame with 68 observations on the following 3 variables.

meth

a factor with levels Wright and Mini, representing measurements by a Wright peak flow meter and a mini Wright meter respectively, in random order.

item

Numeric vector, the person ID.

y

Numeric vector, the measurements, i.e. PEFR for the two measurements with a Wright peak flow meter and a mini Wright meter respectively. The measurement unit is l/min.

repl

Numeric vector, replicate number. Replicates are exchangeable within item.

Source

J. M. Bland and D. G. Altman (1986) Statistical Methods for Assessing Agreement Between Two Methods of Clinical Measurement, Lancet. 1986 Feb 8;1(8476):307-10.

Examples

data(PEFR)
PEFR <- Meth(PEFR)
summary(PEFR)
plot(PEFR)
plot(perm.repl(PEFR))

Example output

Loading required package: nlme
The following variables from the dataframe
"PEFR" are used as the Meth variables:
meth: meth 
item: item 
repl: repl 
   y: y 
         #Replicates
Method            2 #Items #Obs: 68 Values:  min   med max
  Mini           17     17       34          227 444.5 658
  Wright         17     17       34          165 432.0 656
         #Replicates
Method            2 #Items #Obs: 68 Values:  min   med max
  Mini           17     17       34          227 444.5 658
  Wright         17     17       34          165 432.0 656

MethComp documentation built on May 2, 2019, 5:06 p.m.